Cheers erupted and sparks flew as Machine Gun Kelly brought a very special guest onstage with him at a show during the Indy 500 weekend: His girlfriend, Megan Fox.
The two appeared together as he performed at Barstool Sports' party at Grand Park in Westfield, Ind. on Friday, May 28. The 31-year-old rocker briefly puffed on what appeared to be a cigarette and handed it to the 35-year-old actress, who also took a puff, after which he began performing his song "I Think I'm Okay."
"She came out after everyone was chanting 'Megan' for some time," an eyewitness told E! News. "Then she did stay on the stage in the background for the whole song."
The lovebirds, who have become one of the most popular new couples over the past year, were later spotted cuddling backstage.
Kelly, whose real name is Colson Baker, and Fox took part in the show almost a week after they walked the red carpet together at the 2021 iHeartRadio Music Awards in Los Angeles, which followed an equally sizzling joint appearance at the 2021 Billboard Music Awards.
Kelly and Fox met in early 2020 while filming Randall Emmett's movie Midnight in the Switch Grass.
In April of that year, E! News learned that Fox and husband Brian Austin Green, with whom she shares three sons, were no longer living together. The Beverly Hills, 90210 alum confirmed their separation in a podcast interview a month later.
In late May 2020, Fox starred in Kelly's music video "Bloody Valentine." Then on the 25th of that month, she told him, "I love you," as the rocker would recall on Twitter a year later. They made their public debut as a couple the following June, when they were spotted leaving a bar together in the Los Angeles area.
In November 2020, Fox and Kelly made their red carpet debut as a couple at the 2020 American Music Awards. Days later, the actress filed for divorce from Green after 10 years of marriage.
And speaking of "Bloody Valentines," this past February, Kelly shared Instagram photos showing him and Fox, as well as a pic of a pendant necklace with a vial that appeared to contain a drop of blood.
"I wear your blood around my neck," he wrote, adding emojis that symbolize a knife, a drop of blood, a DNA symbol and a rose. "My bloody valentine."
This past April, a source close to Fox said the actress and Kelly "plan to get engaged and married" when her divorce from Green is finalized.
"They are very much in love and have a strong and intense relationship," the source said. "Her divorce is moving along, and they are hashing out custody details."
See photos of Fox and Kelly's cutest moments together:
July 2020: How They Met
The couple did their first podcast together and detailed how they met on the set of the movie Midnight in the Switchglass. They also became Instagram official in July when MGK posted a selfie of the couple with the caption, "Waited for eternity to find you again..."
August 2020: Megan Professes Her Love
The actress shared the first photo of herself with her new man captioning it, "Achingly Beautiful Boy... My heart is yours."
November 2020: Red Carpet Official
The couple made their first red carpet appearance at the American Music Awards. The same month, the actress files for divorce from estranged husband Brian Austin Green, with whom she shares three sons.
April 2021: Double Birthday Date
Double date! The duo celebrates MGK's birthday with friends Kourtney Kardashian and boyfriend Travis Barker.
May 2021: iHeartRadio Music Awards
Pretty in pink! Megan supports Machine Gun Kelly as they attend the iHeartRadio Music Awards in Los Angeles.
May 2021: Billboard Music Awards
The lovebirds arrive at the 2021 Billboard Music Awards in Los Angeles.
May 2021: Onstage Love
The two appear onstage during the rocker's show at the Barstool Sports Indy 500 party at Grand Park in Westfield, Indiana.
January 2022: We're Engaged
New year, new relationship status! On Jan. 12, 2022, Megan Fox and Machine Gun Kelly announced on Instagram that they were engaged. "Yes, in this life and every life," the musician wrote on Instagram.
October 2022: Pam & Tommy
The two dressed up as Pamela Anderson and ex-husband Tommy Lee at the annual Casamigos Halloween party.
February 2023: Grammys Date Night
The two embraced on the red carpet on music's biggest night.
May 2023: London Date Night
Megan supported MGK at the unveiling of The 8th Deadly Sin - GOSSIP, a limited-edition ring collection collab by the musician and Stephen Webster in London.
October 2023: Happy Halloween
The two also partied at Vas Morgan and Michael Braun's Halloween party.
October 2023: Kill Bill Couple
The two appeared at the annual Casamigos Halloween party.
March 2024: Megan Gives Relationship Update
The actress confirmed that she and MGK had at one point called off their engagement.
"What I've learned from being in this relationship is that it's not for public consumption," she said on the Call Her Daddy podcast. "So I think as of now, I don't have a comment on like the status of the relationship."
She continued, "What I can say is, that is what I refer to as being my 'twin soul', and there will always be a tether to him no matter what."
November 2024: Baby on Board
The couple shared that they were expecting a baby together with Megan writing on Instagram, "Nothing is ever really lost. Welcome back," alongside a photo posing naked covered in black paint and holding her baby bump.
She also included a picture of a pregnancy test with the word, "Yes."
November-December 2024: Breakup
In late November, shortly after confirming Megan's pregnancy, the duo called it quits, multiple outlets reported Dec. 10.
March 2025: It's a Girl!
The duo welcomed daughter on March 27, 2025. According to MGK, Megan gave birth while listening to a score composed by himself and pal Travis Barker.
The rocker said he named their baby girl Saga Blade Fox-Baker because she's the five-year culmination of "coming, disappearing, coming back again, disappearing, coming back again."
“She is an epic story," he told Today. "That's what saga means.”
—Reporting by Holly Passalaqua